Page 1. Page 2. Page 3. Page 4. ECH81 Datasheet PDF Download – Triode – Heptode, ECH81 data sheet. Class, Va, Vg2, Vg1, Ia, Ig2, Ra, S, Notes. Static, , , , , Triode section. Frequency changer, , , Triode section. Static, , , , ,

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Collection of Ottmar Rollmann D. Collection of Ralf Meinke D. They naturally show different values for a different usage volts anode. Note the non-inverting voltage gain and negative exh81 from G3 to G2-G4. We don’t want “jumping to conclusions”.

All joking aside, thank you for yet another informative and interesting article. It is quite understandable, better performances at low supply voltages can be obtained by reducing the spacing of the electrodes in the first place!

(PDF) ECH81 Datasheet download

This has raised some interesting points and a first quick test indicated very similar current and conductance values at low voltages also on the ECH81 which gives credence to the intial article. Collection of Otto Frosinn D. From these traces, it can be concluded: Collection of Karl – Heinz Bossan Xatasheet. Collection of Tomasz Szczesniak PL. Only the ECC 86 tube utilizes different special technology ……. There is no difference in construction! Another ECH81 from the collection.


Above the main assembly the cathode continues and a single grid can be seen.

Collection of Kazimierz Rch81 S. ECH 83 for low voltage only. Collection of Klemens Rhode D. Collection of Jacky Parmentier F. So this curves are not directly comparatible to the curves in the first figure.

(PDF) ECH81 Datasheet PDF Download – Triode – Heptode

Collection of Tor Steinnes N. No – please wait. The following picture shows how a grid is positioned under the stereo-microscope to measure each grid position or the differences of distances between each wire. The triode is to be used as the local oscillator feeding the 13 Volts amplitude sine wave to the heptode mixer. Collection of Stig Comstedt S. Here the notch and peening method of securing the grid wire can be plainly seen in the outermost grid.

Drehen wir uns im Kreise?? Collection of Christian Schaufelberger CH. The very modest gm3 has hardly any effect when added to gm1 by driving both grids simultaneously as seen in the next photo. Collection of Patrice Zeissloff F. Nanu, doch alles o. Suddenly I remember some experiments done with a breadboard mixer-circuitry a few years ago.

It would be useful to assess further examinations and tests; in particular, codes on the Philips group tubes and possibly physical examination of the construction. Note how severe the attenuation is at low control grid G1 voltages at 0V. This is the nominal recommended screen bias. To be on the safe side, I opened both tubes to look for any differences in the system itself.

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As clearly was done. The way how to help here is given in my posts. If members have these types perhaps they could report the codes by mail so dstasheet we can get a better overall view. I include here some additional curves that datashee the behaviour of G3, which is normally used for ratasheet oscillator LO injection. You even can look up radio models with a certain tube line up.

Wire diameters and thicknesses have been tested with a micrometer of a resolution of 0. Collection of Alberto Zappacosta I. Jacob has used it in many of his transmitter and receiver designs. Collection of Alexander Hofer A.

Collection of Emilio Focosi I.

See this forum article here about that. Collection of Ekkehard Pfau D. Collection of Georges Werts B.

Collection of Aires Gomes P. They naturally show different values for a different usage volts anode. A fuller translation is HERE. In the self-oscillating configuration, the nominal transconductance is uS, and up to uS with a heavy 1mA separate LO injection into G1.